Extensible bracelet



Nov. 10, 1931. s. A. JOHNSON 1,831,452

EXTENSIBLE BRACELET Filed July 25, 1929 w H W Ir IM 'WW IMHWIIHIIM INVEN TOR.

ATTORNEYS.

modified form of lock.

Patented Nov. 10', 1931 UNITED STATES PATENT OFFICE SYLVEBTEB A.JOHNSON, 01' NORTH PROVIDENCE, RHODE ISLAND, ASSIGNOB '10 SPEIDEL 3308.,O1 PROVIDENCE, RHODE ISITLND, A FIRE COMPOSED OF ALBEBII. E. R. BPEIDELAND EDWIN I. I. BPEIDEL, 30133 Or ORANSTON, RHODE ISLAND EITENSIBLIBRACELET Application filed July 23,

The present invention relates to extensible straps and bracelets, andparticularly pertains to straps for wrist watches.

One object of the invention is to provide an improved constructionpermitting any desired change in len th of an extensible strap.

Another object Is to provide means for positively locking the extensiblebracelet or strap in its adjusted position.

A further object is to provide an extensible bracelet which has a muchgreater range of extension than similar bracelets of other types.

An additional object is to rovide an extensible bracelet which may eadjusted to any length without materially altering its appearance.

A still further object is to construct an extensible bracelet withoutthe use of extension springs or foldable sections.

Other objects and advantageous features will be readily apparent fromthe detailed description following, in conjunction with the accompanyingdrawings, and will be particularly pointed out in the appended claims.

In the drawings:

Fig. 1 is a plan view of the improved strap;

Fig. 2 is an end View thereof;

Fig. 3 is an enlarged detail showing the underside of the strap;

Fig. 4 is an enlarged View of the connecting link;

Figs. 5 and 6 are enlarged details, partly in section, showing the twoportions in locked and unlocked positions;

Fig. 7 is a sectional view on the line 7-7 of Fig. 5;

Figs. 8 and 9 are perspective views, respectively, showing the guideloop and the locking projection of the underlying portion and Fig. 10 isa view partly in section, of a I have found it desirable to provide asion without a resulting change in the general appearance andornamentation of the bracelet, and I have devised an extensible braceletwhich comprises two overlying portions, the extension being secured bymoving one of 1m. lerlal No. 880,384.

these rtions relatively to the other, one portion aving a series ofspaced indentures invisible from the top, within which a projection onthe other portion enters to lock the two portions in adjusted position,the free end of the first portion then being frictionally engaged withthe other portion to maintain the two portions together; and thefollowing is a detailed descri tion of constructions which embody the avantageous features of my invention.

Referring to the drawings, 10 designates "the strap as a unit, the strapcomprising an overlying portion 11, an underlying portion 12, and in thespecific form disclosed, two end links 14 and thus hingedly connect thelinks together and leave indentations in the bracelet to be utilized ashereinafter explained.

The underlying portion 12 has an end member 20 secured thereto, rolledin cylindrical form to position and retain a pivot pin 21 therein; aguide loop member 22, having extending end-portions 23 with alignedopenings 24 therein; is rotatably mounted on the pivot pin 21-. Theoverlying portion 11 extends through this guide loop member 22 and islocked in the desired position by'a projection 25, integral with orotherwise secured to the end member 20 of the underlying portion, whichprojection extends upwardly from the lower ortion 12 to be received inthe indentation 1n the bracelet between two adjacent connecting links 17which form abutments for engagement with the projection 25.

The free end of the upper portion 11 terminates in'a clasp member 26pivotally secured to the end link thereof, which member 26 has dependingsides 27 for frictionally engaging the sides of the bracelet of theunderlying portion 12; the upper portion of the member 26 being formedas a. finger-engageable part 28, the finger normally lifting this partfor releasing the frictional engagement of the member 26 with theunderlying chain portion 12.

When desired, the two strap portions may be of relatively smoothmaterial, in which case the clamping surface is enlarged to increase itsfrictional engagement with the smaller bracelet by mounting a member 29,as indicated in Fig. 10 thereon, which is also pivotally mounted on thepin 21 and is positioned within theioop member 22, the openings in thesides thereof being large enough to permit a limited movement of themember 29 with respect to the loop member 22 and the engaging portion of29 being sufficiently flexible to permit disengagement when desired. Anupward movement of the projection 25 will thus cause the upward movementof member 29 and firmly frictionally grip the overlying strap memberbetween the loop member 22 and the member 29.

The adjustment of the improved bracelet or strap is as follows:

The engagement of the finger with part 28 disengages the clasp member 26from the lower strap portion, and permits a movement of the lowerportion away from the upper portion, thus moving the projection 25 outfrom the indenture on the under surface of the bracelet. The upperportion may now be moved through the loop member until the desiredadjustment is obtained; movement of the lower portion to be adjacent andin overlying relation with the upper portion now causes the projection25 to enter a selected indenture in the overlying portion. the claspmember 26 now being moved to frictionallv engage the underlying portionthereunder.

The improved bracelet is therefore simple in structure, and permits anydesired adjustment in length without materially changing the appearanceof the bracelet. thus eliminating all need for spring elements or forextension members.

While I have described specific forms of bracelets or straps constructedin accordance with the principles of my invention, it is obvious thatdesired changes in structure or in arrangement may be made, within thescope of the invention as defined in the appended claims.

I claim:

1. A wrist watch strap comprising two separate parts having contiguousend portions, one of which overlies the other, bailengaging elements atthe free ends thereof, a guide loop carried at the other end of theunderlying portion through which the overlying portion. extends, meansfor locking said guide loop end to the overlying portion, and detachableclamping means for clamping the other end of the overlying portion tothe underlying portion.

2. A wrist watch strap comprisin two separate parts having contiguous enportions, one of which overlies the other, bail engaging elements at thefree ends thereof, a guide loop carried at the other end of theunderlying portion through which the overlying portion extends, meansresponsive to movement of the underlying portion for locking said guideloop end to the overlying portion, and means for clamping the other endof the overlying portion to the underlying portion.

3. A wrist watch strap comprising two end portions, one of whichoverlies the other, a guide loop carried by the end of the underlyingportion through which the overlying portion extends, and meansresponsive to movement of the underlying portion for locking said guideloop end to the overlying portion.

4. A wrist watch strap comprising two end portions, one of whichoverlies the other, a guide loop carried by the end of the underlyingportion through which the overlying portion extends, and a memberpivoted to said guide loop to' lockingly engage said overlying portion,said underlying portion being attached to said member whereby the end ofthe underlying portion and said member will move together.

5. A wrist watch strap comprising two end portions, one of whichoverlies the other, a guide loop carried by the end of the underlyingportion through which the overlying portion extends, a member throughwhich said underlying portion is connected to said guide for movementtherewith, and means on said member to lockingly engage said overlyingportion.

6. A wrist watch strap comprising two end portions, one of whichoverlies the other, a. guide loop carried by the end of the underlyingportion through which the overlying portion extends, a member throughwhich said underlying portion is connected to said guide for movementtherewith, and a protuberance on said member to lockingly engage saidoverlying portion.

7. A wrist watch strap comprising two end portions. one of whichoverlies the other, a. plurality of indentures on one portion facing theother portion, a guide loop carried by the end of one of said portionsthrough which the other portion extends, and means including aprojection for engaging in the indentures on one portion and responsiveto the movement of the other portion for locking said guide loop end inposition.

8. A wrist watch strap comprising two end portions, one of whichoverlies the other, a plurality of indentures on the overlying por tionfacing the underlying portion, a guide tion through which the overlyingportion extends, and means including a injection for engaging in theindentures on t e overlying portion and responsive to the movement ofthe underlying portion for locking said guide --loop end to theoverlying portion.

In testimony whereof I aflix my signature.

SYLVESTER A. JOHNSON.

